Unit testing 用Rails夹具进行单元测试

对不起，问题的标题很模糊，但我很难把我的问题提炼成一行

我通过

railsgscaffold

生成了几个简单的Rails（3.1）模型，我正在尝试对其进行单元测试。它们的定义如下：

class ModelA < ActiveRecord::Base
  validates_presence_of :field1, :field2
  validates_uniqueness_of :field1
end

class ModelB < ActiveRecord::Base
  validates_presence_of :field1
  validates_uniqueness_of :field1
end

及

我的单元测试正在测试这些验证：

class ModelATest < ActiveSupport::TestCase
  test "field1 should be present" do
    assert !model_as(:model_a_no_field1).valid?
  end

  test "field2 should be present" do
    assert !model_as(:model_a_no_field2).valid?
  end

  test "field1 should be unique" do
    model_a = model_as(:model_a_ok)
    model_a.save

    assert !model_as(:model_a_ok).valid?
  end
end

第二次测试失败（测试唯一性）

我几乎可以肯定这与

型号b_no_field1

的空YAML夹具有关，但我不确定。我可以通过将测试方法主体替换为

test "field1 should be unique" do
  model_b = model_bs(:model_b_ok)
  model_b.save

  model_b2 = ModelB.new

  assert !model_b2.valid?
end

---

这很好，但我想了解这里发生了什么。

我认为您正在破坏rails为您创建的测试基础架构。yaml文件中的模型应该是有效的，如果要测试无效的东西，请在测试中创建它

在测试中创建数据具有非常清晰和具体的额外价值。否则，开发人员需要打开yaml文件，以了解您拥有哪些数据以及缺少哪些数据

class ModelATest < ActiveSupport::TestCase
  test "field1 should be present" do
    assert !model_as(:model_a_no_field1).valid?
  end

  test "field2 should be present" do
    assert !model_as(:model_a_no_field2).valid?
  end

  test "field1 should be unique" do
    model_a = model_as(:model_a_ok)
    model_a.save

    assert !model_as(:model_a_ok).valid?
  end
end

class ModelBTest < ActiveSupport::TestCase
  test "field1 should be present" do 
    assert !model_bs(:model_b_no_field1).valid?
  end

  test "field1 should be unique" do 
    model_b = model_bs(:model_b_ok)
    model_b.save

    assert !model_bs(:model_b_ok).valid?
  end
end

test "field1 should be unique" do
  model_b = model_bs(:model_b_ok)
  model_b.save

  model_b2 = ModelB.new

  assert !model_b2.valid?
end